@ electronicsguy
I tried what you suggested above and now I'm getting the message 'Unable to start My WiFi Technology'. I also noticed that I'm getting the yellow triangle with '!' next to the Intel Centrino Wireless -N + WiMax 6150 driver in device drivers.
Something I noticed is that the driver listed on Sony's driver and software website is a 6150 while the original specs from my model list my WiFi adapter as a 6250. Please understand that I've had the 6150 driver installed and am able to connect wirelessly to the internet. I had run the 6250 driver at some point and this didn't work but I may give it one more try.
I'm so tired of ripping out and re-installing these drivers (every time I do, I can't connect to the internet so I have to run system restore). I feel like I'm about to cut my losses - after, of course, I write a not so friendly review of Intel's retarded product!